Telephone-ringer.



H. TIDEMAN. TELEPHONE BINGEB: urmouzon rum) JULY 6, 1907.

901,269. Patented Oct. 13,1908.

Irwerzbr: 7 5 Henyfideman UNITED s'rATEfs PATENT OFFICE.

. HENRY rinnmmior. MENOMINEE, MICHIGAN.

.rnmrnonammenn.

To dll:W|om it may concern; a -jBe-1thkn0wn that I, HENRY TIDEMAN, a citizen ofthe United States of-America,.-a'nd a resident of Menominee, county of Menominee, and State of Michigan, have invented a new andgusefullm rovement -m Tele- .=phone-Rin'gers, of" whic the following is a specification.

- My invention pertains to improvement in theclass "of devices known as telephone ringers, and particularly tothose forms adapted to produce audible signals in response to alternating currents.

My invention has as its object the provision of a ringer which, when once assembled in proper adjustment, will reta'mthat" adjustment permanently, and

1c further.

has such simple-structure andfde'tails'fas to of Fi '1, and

U-shape, polarized with consequent and of opposite ends 10"- 10";

render its assembly and adjustment a .computatively easy task. v I providea U-shaped permanent magnet with a magnetic yoke brid ing the poles thereof, the operating parts eing moon ted upon that yoke.

In the drawings, l igure 1 show vs side view of'my ringer, Fig. 2 "shows a. top view fiig. 3 showsa'view at right angles to Fig. L. apart of the lower portion of the=ringerbeiiigbroken away, with (le tailson the line A-B shown in section.

In Fig. 1, 1'0 is a permanent magnet of poles which are of -one "adl'arity' in the middle 10 ola'rity at each of the two cross the ends of the magnet 10' is the magnetic. yoke 11; this is per- .forated' at 115; to permit the rod of the tap- A i 12- to pass through, and has two e'a'rs' -11 11f eachjof which is perforated for a screw, for mountingthe ringer to the interim: surface of the. wooden containing box,

"through the wa'll of which the tapper 12 "rojectB.'-.-"1he ends 'of the oke 11- are orniedupzinto" lug's' at 1 1 .whic are slotted;

the screw 11 passes through the slot of the 'lug;11".--ahd threads into the magnet 10,

the magnet 10, but'having'inherentlg a post e s clamping the: yoke 11 rigidly in place upon sibl'e adjustment reason of ots through which-thescrew llpasses- Upon the magnetic yoke 11 are. mounted the ringers 'oolsor'coils 13-by. screws assi'ngthrough,

' yoke 11; ,The cores'of t was ools-proimam; and-bear collars 14 slide '1. placed the. 'projectinqeores. .Then n-ma heti'e yoke 151s rigidly attached to the co Specification of Letters Patent. Application fled July 6, E07,. Serial No. 3823,4629,

'serted into the metal Patented Oct. 1s, 190a.

lars 14-14 by any desired means, the means shown being a drive fit of the yoke 15- upon ashoulder in each of the collars 14, the re-v of' the cores 13 to prevent the sticking of the armature.

The assembly of the" device for manufacture is as follows: The coils 13 are mountis placed in -the yoke 15-; the

v permanent magnet 10 is permanently attac ed to the magnetic yoke 11; the sprin 17' is placed with= in the perforation of t 1e. armatm'e 18; the screw 1.7 is passed through perforation in the magnet. 10, then throu h the interior of the spring 17 an'dis threa ed into the bushing 16; the deviceis now ready jfor adjustment, Theserew 17 tends to draw the yoke 15 away from the heads of thespools while the spring 17, being a compression spring between the yoke 15 and the magnet 10, tends 'to force the yoke "15 toward Ehflheadsjof the spools; 13 and against the restraint of the screw' 17 the armature 18, carried. byzthe 'yoke'15, may therefore approach or recede with referenceto the core ends 13 under-- control ofjthe srew '17. The screw 17- is turned until an approximate adjustment of the armature 18 to the core ends is attained.

The lock screws 14 14' then are turned firmly .to lock the collars 14 14 upon the core ,ends13 13., In looking thecollars14 14 in this position of adjustment, it is desirable. to lock the armature too close to the cores rather than too fan-away, and a final ad justment then may be made b turning the screw 17, an ad ustmei'it wi him a slightrange bei-n possihle by the'elasticity of the yoke .15.. f the range of ad'ustment by the sliding of the cores 14 upon t e core ends 13' is not sufiiciently'. great, as. might .be true througherror in manufacture of parts or -through the neoessity'of replacing the spools-r 175'.- ed upon-the magnetic yoke 11" non-magnetic' yoke 151wit-h its inte ral colla rs 14 is placed- -upon the free ends 0 the coils; the armature.

13 with spools in which the longer core terminals were not provided, the initial loug'h adjustment may be en plemented or may be replaced entirely by the adjustment made possible by the revision of slots in the lugs 11, the final a justmentbeing made by elasticity of ")ke 15 as described.

Havingthus dc. ribed my inventiomwhat I claim as new and desire to secure by United States Letters Patent is:

In a telephone ringer, a Ushaped permanent magnet; a magnetic yoke havmg its ends bent at ri ht angles and extending arallel 'to'theends of said U-shaped magnet or attachment thereto; electromagnets mounted upon said yoke and lying within the 'U of said permanent magnet; a nonmagnetic yoke rigidly attached at its ends to the free ends of the cores of said electromagnets and bearing trunnions at its median part; an armature carried by said tru-nnions; a tapper rod secured to sald armature and assing through said magnetic yoke; and an adjusting screw passing throu h the center of saidpermanent magnet an adapted to flex said non-ma etic yoke whereby the adjustment of mg? armature to the ends of said cores may be determined, substantially as described.

Signed by me at Menominee, county of Menominee and State of Michigan, in the presence of two witnesses.

I HENRY TIDEMAN.

Witnesses:

LEOPOLD JACKMAN, F. J. DONOVAN. 

